作业帮she has been in hospital since she was shot on the head 为什么要用since不能用after除了前面是现在完成时这个理由
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she has been in hospital since she was shot on the head 为什么要用since不能用after
除了前面是现在完成时这个理由
原因：since是“自从...以来”,与现在的时间有关联；而after是“在.时间之后”,不一定和现在的时间有关联.
此外,after 和since 的用法如下：
1.一般说来,如果在过去某一时间内先后发生了两个动作,那么先发生的动作用过去完成时（从句）,后发生的动作用一般过去时（主句）.
如果使用连词after 来连接这两个动作,由于after本身已说明了两个动作的先后关系,所以两者均可用一般过去时.
2.since “自从” 在这里since是连词,后面接的是时间状语从句 she was shot on the head.
“since+过去的时间点”表示一段时间,即从这一时间点一直到现在这一段时间.
含有“since+过去的时间点”的句子谓语动词要用现在完成时.
祝开心~
因为前面是has been，在现在完成时里面要用since。
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